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Published:   , doi: 10.1088/1674-1137/44/2/024106
Abstract:
Within the one boson exchange model, \begin{document}$\Delta$\end{document}-mass dependent M-matrix and its influence on the calculation of \begin{document}$N\Delta \to NN$\end{document} cross sections are investigated. Our calculations show that the \begin{document}$m_{\Delta}$\end{document} dependence of \begin{document}$|{{p}}_{N\Delta}|$\end{document} and \begin{document}$|\mathcal{M}|^2$\end{document} has effects on the calculations of \begin{document}$\sigma_{N\Delta\to NN}$\end{document}, especially around the threshold energy.
Published:   , doi: 10.1088/1674-1137/44/2/021001
Abstract:
From April to July 2018, a data sample at the peak energy of the \begin{document}$\varUpsilon \left( {4{\rm{S}}} \right)$\end{document} resonance was collected with the Belle II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle II experiment. Using Bhabha and digamma events, we measure the integrated luminosity of the data sample to be (\begin{document}$496.3 \pm 0.3 \pm 3.0)\;{\rm pb}^{-1}$\end{document}, where the first uncertainty is statistical and the second is systematic. This work provides a basis for future luminosity measurements at Belle II.
Published:   , doi: 10.1088/1674-1137/44/2/025101
Abstract:
In this paper, we have discussed the effects of quantum fluctuations spewed by a black hole on its deflection angle. The Gauss-Bonnet theorem (GBT) is exploited with quantum corrections through the Extended Uncertainty Principle (EUP) and the corresponding deflection angle is obtained. Moreover, we have attempted to broaden the scope of our work by subsuming the effects of plasma medium on the deflection angle as well. To demonstrate the degree of difference, the acquired results are compared with the prevailing findings.
Published:   , doi: 10.1088/1674-1137/44/2/024105
Abstract:
Base on Froissart-Martin theorem, the Regge theory and the possible Odderon exchange, the total cross section \begin{document}$\sigma_{\rm tot}$\end{document} and the ratio of the real-to-imaginary part of the forward scattering amplitude \begin{document}$\rho$\end{document} for \begin{document}$pp$\end{document} and \begin{document}$\bar{p}p$\end{document} elastic collisions in the TOTEM energy region are studied in the FPO model. We consider the contributions from Froissart bound, Pomeron, Reggeon and Odderon exchange terms to the scattering amplitude of \begin{document}$pp$\end{document} and \begin{document}$\bar{p}p$\end{document} elastic collisions. Using the Odderon intercept, \begin{document}$\alpha_{\rm O}(0)=0.5$\end{document}, our theoretical predictions are in good agreement with at the recent results of the TOTEM experiment. The results show that the Odderon corresponding odd elastic scattering amplitude likely exist.
Published:   , doi: 10.1088/1674-1137/44/2/024104
Abstract:
By considering the magnetic field response of the QGP medium, we make a systematically study of the chiral magnetic effect (CME), and compare it with the experimental results for the background-subtracted correlator H from RHIC beam energy scan (BES) to LHC energies. The CME signals from our model computations show a centrality trend and beam energy dependence that are qualitatively consistent with experimental measurements of charge dependent correlations. And then, the time evolutions of chiral electromagnetic current from RHIC BES to LHC energies are systematically studied. The dependencies of time-integrated current signal on the wide range of beam energy \begin{document}$\sqrt{s}$\end{document} with different centralities are investigated. Through our phenomenological analysis, it is found that the time-integrated electromagnetic current maximizes near \begin{document}$\sqrt{s} \approx 39$\end{document} GeV of collision energy. The qualitative trends of induced electromagnetic current with collision energies are in agreement with from CME experimental results of from RHIC BES to LHC energies.
Published:   , doi: 10.1088/1674-1137/44/2/023104
Abstract:
In this paper, we studied the semileptonic decays \begin{document}$B_c^- \to (\eta_c, J/\psi) l ^- \bar{\nu}_l$\end{document} by employing the PQCD factorization approach, using the newly defined distribution amplitudes of the \begin{document}$B_c$\end{document} meson and the new kind of parametrization for extrapolation of the form factors, and also taking into account the lattice QCD results about the relevant form factors at several points. We found the following main results: (a) the PQCD predictions for the branching ratios of \begin{document}$B_c \to (\eta_c,J/\psi) l \bar{\nu}$\end{document} decays will become a little smaller by about 5%-16% when the lattice input are taken into account in the extrapolation of the relevant form factors; (b) the PQCD predictions for the ratio \begin{document}$R_{\eta_c}, R_{ J/\psi}$\end{document} and the longitudinal polarization \begin{document}$P_{\tau}$\end{document} are \begin{document}$R_{\eta_c}=0.34\pm 0.01, R_{J/\psi}=0.28\pm 0.01$\end{document}, \begin{document}$P_{\tau}(\eta_c) = 0.37\pm 0.01$\end{document} and \begin{document}$P_{\tau}(J/\psi) = -0.55 \pm 0.01$\end{document}; and (c) after the inclusion of the lattice input the theoretical predictions changed slightly: \begin{document}$R_{\eta_c}=0.31\pm 0.01$\end{document}, \begin{document}$R_{ J/\psi}=0.27\pm 0.01$\end{document}, \begin{document}$P_{\tau}( \eta_c) = 0.36 \pm 0.01$\end{document} and \begin{document}$P_{\tau}( J/\psi) = -0.53\pm 0.01$\end{document}. The theoretical predictions for \begin{document}$R_{ J/\psi}$\end{document} agree with the measured one within errors, and other predictions could be tested in the near future LHCb experiments.
Published:   , doi: 10.1088/1674-1137/44/1/014003
Abstract:
The 6Li(n, t)4He reaction has been measured as the first experiment of neutron induced charged particle emission reaction at CSNS (China Spallation Neutron Source) Back-n white neutron source. Differential cross sections of the 6Li(n, t)4He reaction at 15 detection angles ranging from 19.2° to 160.8° are obtained from 1.0 eV to 3.0 MeV at 80 neutron energy points. Among them, the differential cross sections at 50 energy points below 0.1 MeV are reported for the first time. The results indicate that the anisotropic of the emitted tritons is noticeable above En = 100 eV. Also, the angle-integrated cross sections are obtained). The present differential cross sections agree with the evaluations in general while there are some differences in detail. More importantly, the present results indicate that the cross sections of the 6Li(n, t)4He reaction may be overestimated in most evaluations in the 0.5 − 3.0 MeV region although they are recommended as standard below 1.0 MeV.